1 min read21-Inch Hypersonic Tunnel at Plum Brook Station at Lewis Research CenterOIG CommunicationsJan 14, 1997 Article January 14, 1997 Download Report 21-Inch Hypersonic Tunnel at Plum Brook Station at Lewis Research Center (IG-97-013) Jun 21, 2024 PDF (577.74 KB) Share Details Last Updated Nov 22, 2024 Related TermsAudit ReportsFY1997Office of Inspector General (OIG)